If you are looking for the best and most efficient tool for converting MBOX files, I suggest you to MailsDaddy MBOX To PST converter solution. Below is a discussion of all the features in detail.
Features:
This solution provides complete data integrity without any changes in folder structure, metadata properties, and text formatting.
Allow users to view all emails in the mail section, before the conversion period.
Compatible with over 30 desktop-based email clients including ( Mozilla Thunderbird, Postbox, Apple Mail, Webmail, Eudora, Netscape, Seamonkey, Claws mail), etc.
After conversion import MBOX mail in Outlook 2019, 2016, 2013, 2011, 2010, and 2007.
Many options for exporting MBOX files to PST, HTML, EML, RTF, MSG, and MHTML according to user requirements.
Add single and multiple MBOX files at one time that can be converted to PST.
This utility is compatible with all versions of windows os ( 2007, 2008, 2010, 2011, and Windows XP).
Offers a free trial version for all users to converter the first few items per folder before the software is initialized.
The user can easily migrate MBOX to Office 365 and exchange on-premises. This feature is enabled only for Business and enterprise licenses.